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onsemi 1SMB54CAT3
- Part No.:
- 1SMB54CAT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1SMB54CAT3.pdf
- Description:
- TVS DIODE 54VWM 87.1VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:9,957
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Product details
Overview
1SMB54CAT3 from ON Semiconductor is a bidirectional 600 W transient voltage suppressor (TVS) diode designed for overvoltage protection in DC power rails and signal lines. It features a 54 V working peak reverse voltage (VRWM), 66.32 V minimum breakdown voltage (VBR) at 1 mA, clamps to ≤87.1 V at 6.9 A peak pulse current, and responds in <1 ns - deployed in automotive ECUs, industrial power supplies, and telecom interface circuits.
For engineers reviewing the 1SMB54CAT3 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM margin vs. operating voltage, clamping ratio (VC/VBR), surge current capability (IPP = 6.9 A), UL 497B certification for isolated loop protection, and SMB (DO-214AA) surface-mount compatibility with FR-4 PCB thermal management.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, enabling robust protection against positive and negative transients without polarity sensitivity. Its low zener impedance and fast <1 ns response ensure minimal overshoot during ESD or lightning-induced surges.
The device uses a silicon avalanche structure optimized for 600 W non-repetitive 1 ms pulses (10/1000 µs waveform), with thermal resistance of 226 °C/W (junction-to-ambient) on standard FR-4 and 40 °C/W (junction-to-lead) under soldered conditions - critical for sustained surge handling in compact layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 54 V - must be ≥ continuous operating voltage to avoid leakage-triggered conduction |
| VBR (min) | 66.32 V @ 1 mA - defines reliable avalanche onset threshold under test conditions |
| VC @ IPP | 87.1 V @ 6.9 A - maximum clamped voltage during 1 ms surge, limiting stress on downstream ICs |
| PPK | 600 W @ 1 ms - peak energy absorption capacity for transient suppression compliance |
| IR @ VRWM | <5 µA - ensures negligible standby power loss and signal integrity in high-impedance circuits |
| ESD Rating | Class 3 (>16 kV HBM) - meets IEC 61000-4-2 Level 4 for system-level ESD immunity |
| UL Recognition | UL 497B QVGV2 - certified for isolated loop circuit protection in safety-critical telecom and industrial systems |
Pinout & Package
Surface-mount SMB package (DO-214AA, Case 403A), bi-directional two-terminal construction with no polarity marking; leads are modified L-bend for enhanced pad contact area and solder reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode | Bi-directional avalanche junction | Either terminal serves as cathode or anode depending on transient polarity - no fixed polarity required in layout |
| Case | Non-electrical mechanical body | Void-free thermosetting plastic housing rated for 260°C/10s soldering; no thermal or electrical connection |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating lines without polarity constraints |
| 600 W peak pulse rating | Handles IEC 61000-4-5 4 kV surge (line-earth) without degradation when properly mounted |
| UL 497B recognition | Validates suitability for primary-side isolation barriers in telecom power interfaces |
| <1 ns response time | Minimizes voltage overshoot before clamping engages - critical for protecting fast CMOS inputs |
| Low leakage <5 µA | Preserves battery life in always-on monitoring circuits and avoids false triggering in high-Z sensors |
Applications
| Automotive Power Rail Protection | Industrial PLC Analog Input Protection |
|---|---|
Use Scenario: 12 V/24 V battery-fed control modules exposed to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Parallel-connected transient clamp placed within 2 cm of microcontroller power pins to limit voltage excursions to ≤87.1 V. Use Value: Prevents latch-up or gate oxide damage in MCU and CAN transceivers during 100 V/200 ms load dump events. | Use Scenario: 4–20 mA current loop inputs in programmable logic controllers subjected to field wiring ESD and induced surges. IC Role / Device Role / Timing Role: Bidirectional TVS installed across input terminals ahead of precision op-amp front-end to shunt transients before amplification. Use Value: Maintains ±0.1% measurement accuracy by limiting common-mode voltage spikes to <87.1 V while adding <0.5 pF capacitance. |
| Telecom Isolated Loop Interface | Medical Equipment Power Entry |
Use Scenario: RS-485 data lines powered via isolated DC-DC converters in base station backhaul equipment. IC Role / Device Role / Timing Role: UL 497B-certified TVS placed on secondary side of isolation barrier to meet telecom safety standards for fault current containment. Use Value: Enables compliance with GR-1089-CORE for lightning-induced surges up to 6 kV without requiring additional isolation components. | Use Scenario: Mains-powered diagnostic imaging devices requiring reinforced insulation per IEC 60601-1. IC Role / Device Role / Timing Role: Primary-side TVS on AC/DC converter input to absorb line transients before they propagate into patient-connected circuits. Use Value: Reduces risk of insulation failure by clamping 10/1000 µs surges to ≤87.1 V, supporting 4 kV dielectric withstand testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ54CA | Same SMB package, identical VRWM (54 V) and VC (87.1 V), but lower PPK (600 W vs. SMBJ's 600 W - same rating), different manufacturer footprint tolerance | No UL 497B recognition; lacks isolated loop certification | Select 1SMB54CAT3 when UL-compliant isolated loop protection is mandatory |
| 1.5SMC54CA | Higher PPK (1500 W), larger SMC (DO-214AB) package, 226 °C/W RJA vs. 1SMB54CAT3's 226 °C/W - identical thermal performance on FR-4 | Requires larger PCB area; not suitable for space-constrained SMB footprints | Choose 1SMB54CAT3 for density-sensitive designs where 600 W suffices and UL 497B is required |
Compared with SMBJ54CA and 1.5SMC54CA, the 1SMB54CAT3 uniquely combines UL 497B certification, SMB footprint compatibility, and verified 600 W surge capability - making it optimal for safety-regulated, space-constrained industrial and telecom interfaces where certification and board area are co-constrained.
Availability
1SMB54CAT3 is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLC analog inputs, and telecom isolated loop interfaces requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for 1SMB54CAT3 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
ON Semiconductor is a global semiconductor supplier specializing in power management, analog, sensor, and discrete solutions for automotive, industrial, and communications markets.
The 1SMBxxCAT3 series was developed specifically for high-reliability transient suppression in safety-critical power and signal interfaces - emphasizing UL 497B compliance, low clamping ratio, and robust surge endurance in compact SMB packaging.
FAQ
What is the clamping voltage of the 1SMB54CAT3 under maximum surge conditions?
The 1SMB54CAT3 clamps to a maximum of 87.1 V at its rated peak pulse current of 6.9 A (10/1000 µs waveform). This value is measured per ON Semiconductor's standardized test conditions and defines the upper voltage limit imposed on protected circuits during worst-case transients - critical for ensuring downstream ICs remain within absolute maximum ratings.
Does the 1SMB54CAT3 require polarity-aware PCB layout?
No - the 1SMB54CAT3 is a bidirectional TVS diode with symmetrical avalanche characteristics, meaning either terminal can serve as anode or cathode depending on transient polarity. Its marking band is omitted per specification, and the device functions identically regardless of orientation on the PCB - simplifying layout and reducing assembly errors.
Is the 1SMB54CAT3 certified for use in safety-isolated circuits?
Yes - the 1SMB54CAT3 carries UL 497B recognition (File #116110, QVGV2 category) for isolated loop circuit protection. This certification validates its performance in telecom and industrial applications where galvanic isolation barriers must withstand specified surge and fault conditions without compromising safety insulation integrity.
What is the thermal resistance of the 1SMB54CAT3 on a standard FR-4 PCB?
On a standard FR-4 board using ON Semiconductor's recommended minimum footprint, the 1SMB54CAT3 has a junction-to-ambient thermal resistance (RJA) of 226 °C/W. This value assumes zero lead length and accounts for heat dissipation through the copper pads - essential for estimating temperature rise during repetitive surge events or elevated ambient conditions.
How does the 1SMB54CAT3 compare to unidirectional TVS diodes in surge protection design?
The 1SMB54CAT3 provides symmetrical clamping for AC or floating signals, eliminating the need for polarity awareness or dual-diode configurations. Unlike unidirectional variants (e.g., 1SMB54AT3), it protects against both positive and negative transients with identical VC and VBR characteristics - ideal for RS-485, CAN, and other differential or bipolar interfaces where polarity reversal may occur.
1SMB54CAT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-214AA, SMB
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 54V
- Voltage - Breakdown (Min):
- 60V
- Voltage - Clamping (Max) @ Ipp:
- 87.1V
- Current - Peak Pulse (10/1000µs):
- 6.9A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 170pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
1SMB54CAT3 FAQ
1.How can I place an order for 1SMB54CAT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMB54CAT3 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for 1SMB54CAT3 reliable?
The price and inventory of 1SMB54CAT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMB54CAT3 is usually 5 days.
3.What payment methods are accepted for 1SMB54CAT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMB54CAT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMB54CAT3?
1SMB54CAT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMB54CAT3 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for 1SMB54CAT3?
For technical support, including 1SMB54CAT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMB54CAT3 requirements.
6.How does Aetrix verify that 1SMB54CAT3 is sourced from the original manufacturer or authorized distributors?
All 1SMB54CAT3 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 1SMB54CAT3 meets industry standards.
7.What is the process for return or replacement of 1SMB54CAT3?
All 1SMB54CAT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMB54CAT3, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The 1SMB54CAT3 part is unused and in its original packaging.
Return procedure for 1SMB54CAT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMB54CAT3 Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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